<template>
    <div>
        <!-- 面包屑导航区域 -->
        <el-breadcrumb separator="/">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>商品添加</el-breadcrumb-item>
        </el-breadcrumb>
        <!-- 卡片区域 -->
        <el-card>
            <!-- 提示区 -->
            <el-alert title="添加商品信息" type="info" center show-icon :closable="false"></el-alert>
            <!-- 步骤条区 -->
            <el-steps :space="200" :active="activeIndex-0" finish-status="success" align-center>
                <el-step title="基本信息"></el-step>
                <el-step title="商品参数"></el-step>
                <el-step title="商品属性"></el-step>
                <el-step title="商品内容"></el-step>
                <el-step title="商品图片"></el-step>
                <el-step title="完成"></el-step>
            </el-steps>
            <!-- tab区域 -->
            <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" label-position="top">
                <el-tabs :tab-position="'left'" v-model="activeIndex" :before-leave="beforeTabLeave"
                    @tab-click="tabClicked">
                    <el-tab-pane label="基本信息" name="0">
                        <el-form-item label="商品名称" prop="goods_name">
                            <el-input v-model="addForm.goods_name"></el-input>
                        </el-form-item>
                        <el-form-item label="商品价格" prop="goods_price">
                            <el-input v-model="addForm.goods_price" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品重量" prop="goods_weight">
                            <el-input v-model="addForm.goods_weight" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品数量" prop="goods_number">
                            <el-input v-model="addForm.goods_number" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品分类">
                            <!-- 商品类别级联选择框 -->
                            <el-cascader expand-trigger="hover" :options="catelist" :props="cateProps"
                                v-model="addForm.goods_cat" @change="handleChange">
                            </el-cascader>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品参数" name="1">
                        <!-- 渲染表单的item项 -->
                        <el-form-item v-for="item in manyTabData" :label="item.attr_name" :key="item.attr_id">
                            <!-- 复选框区 -->
                            <el-checkbox-group v-model="item.attr_vals">
                                <el-checkbox :label="cb" v-for="(cb,i) in item.attr_vals" :key="i" :border="true">
                                </el-checkbox>
                            </el-checkbox-group>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品属性" name="2">
                        <!-- 渲染表单的item项 -->
                        <el-form-item v-for="item in onlyTabData" :label="item.attr_name" :key="item.attr_id">
                            <el-input v-model="item.attr_vals"></el-input>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品图片" name="3">
                        <!-- 上传图片区  action表示图片要上传到的服务器地址-->
                        <el-upload :action="url" :on-preview="handlePreview" :on-remove="handleRemove"
                            list-type="picture" :headers="headerObj" :on-success="handleSuccess">
                            <el-button size="small" type="primary">点击上传</el-button>
                        </el-upload>
                    </el-tab-pane>
                    <el-tab-pane label="商品内容" name="4">
                        <quill-editor v-model="addForm.goods_introduce"> </quill-editor>
                        <el-button type="primary" class="btnAdd" @click="add">添加商品</el-button>
                    </el-tab-pane>
                </el-tabs>
            </el-form>
        </el-card>
        <!-- 预览图片对话框 -->
        <el-dialog title="图片预览" :visible.sync="dialogVisible">
            <span><img :src="previewPath" alt="" class="imgs"></span>
            <span slot="footer" class="dialog-footer">
                <el-button @click="dialogVisible = false">关 闭</el-button>
            </span>
        </el-dialog>
    </div>
</template>
<script>
    import _ from 'lodash'

    export default {
        data() {
            return {
                //步骤条被激活的区域
                activeIndex: 0,
                //添加商品的表单对象
                addForm: {
                    goods_name: '',
                    goods_price: 0,
                    goods_weight: 0,
                    goods_number: 0,
                    goods_cat: [],
                    pics: [],
                    goods_introduce: '',
                    //添加商品接口所需的参数对象
                    attrs: []
                },
                //添加商品的表单验证规则
                addFormRules: {
                    goods_name: [
                        { required: true, message: '请输入商品名称', trigger: 'blur' },
                    ],
                    goods_price: [
                        { required: true, message: '请输入商品价格', trigger: 'blur' },
                    ],
                    goods_weight: [
                        { required: true, message: '请输入商品重量', trigger: 'blur' },
                    ],
                    goods_number: [
                        { required: true, message: '请输入商品数量', trigger: 'blur' },
                    ],
                    goods_cat: [
                        { required: true, message: '请输入商品分类', trigger: 'blur' },
                    ],
                },
                //商品列表数据
                catelist: [],
                //级联选择框的配置对象
                cateProps: {
                    label: 'cat_name',
                    value: 'cat_id',
                    children: 'children'
                },
                //动态参数列表数组
                manyTabData: [],
                //静态属性数组
                onlyTabData: [],
                //上传图片的url地址
                url: 'http://127.0.0.1:8888/api/private/v1/upload',
                //上传图片时，用的是elementui自己封装的ajax，所有没有token，给他添加一个token通过绑定headers属性
                headerObj: {
                    Authorization: window.sessionStorage.getItem('token')
                },
                //浏览图片时的url地址
                previewPath: '',
                //控制图片预览 对话框显示的布尔值
                dialogVisible: false,

            }
        },

        created() {
            this.getCateList()
        },

        methods: {
            async getCateList() {
                const { data: res } = await this.$http.get('categories')
                if (res.meta.status !== 200) {
                    return this.$message.error('获取商品列表失败')
                }
                this.catelist = res.data
                console.log(this.catelist)
            },
            //商品类别级联选择框发送改变触发的函数
            handleChange() {
                if (this.addForm.goods_cat.length !== 3) {
                    this.addForm.goods_cat.length = []
                }
            },
            //点击tab标签页是跳转前触发的函数,第一个参数是即将进入的页面name，第二个参数是即将离开的标签name
            beforeTabLeave(activename, oldname) {
                if (oldname === '0' && this.addForm.goods_cat.length !== 3) {
                    this.$message.error('请先选择商品分类')
                    return false
                }
            },
            //点击tab触发的函数
            async tabClicked() {
                //点击时判断是否是商品属性页面，是就发起请求获取动态参数
                if (this.activeIndex === '1') {
                    const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, {
                        params: { sel: 'many' }
                    })
                    if (res.meta.status !== 200) {
                        return this.$message.error('获取动态参数列表失败')
                    }
                    //先把服务器返回的参数字符串循环成一个数组
                    res.data.forEach(item => {
                        item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
                    })
                    this.manyTabData = res.data
                    console.log(res.data)
                }
                else if (this.activeIndex === '2') {
                    const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, {
                        params: { sel: 'only' }
                    })
                    if (res.meta.status !== 200) {
                        return this.$message.error('获取静态参属性表失败')
                    }
                    this.onlyTabData = res.data
                    console.log(res.data)
                }
            },
            //预览图片事件
            handlePreview(file) {
                this.previewPath = file.response.data.url
                this.dialogVisible = true
            },
            //区处理移除图片的操作
            handleRemove(file) {
                //创建服务器保存的文件路径
                const fileurl = file.response.data.tmp_path
                //找到addForm中保存的路径的索引
                const i = this.addForm.pics.findIndex(x => {
                    x.pic === fileurl
                })
                //移除addForm中的pics中的该路径
                this.addForm.pics.splice(i, 1)
            },
            //图片上传成功的回调函数，参数服务器返回的数据
            handleSuccess(res) {
                //按照文档格式创建对象
                const picInfo = { pic: res.data.tmp_path }
                //把图片路径添加到addform对象的pic数组中
                this.addForm.pics.push(picInfo)
                console.log(this.addForm.pics)
            },
            //提交商品按钮
            add() {
                this.$refs.addFormRef.validate(async valid => {
                    if (!valid) {
                        return this.$message.error('请填写必要的信息')
                    }

                    //把addform深拷贝一下
                    const form = _.cloneDeep(this.addForm)
                    form.goods_cat = form.goods_cat.join(',')
                    //处理动态参数
                    this.manyTabData.forEach(item => {
                        const info = {
                            attr_id: item.attr_id,
                            attr_value: item.attr_vals.join(' ')
                        }
                        this.addForm.attrs.push(info)
                    })
                    //处理静态属性
                    this.onlyTabData.forEach(item => {
                        const info = {
                            attr_id: item.attr_id,
                            attr_value: item.attr_vals
                        }
                        this.addForm.attrs.push(info)
                    })
                    form.attrs = this.addForm.attrs
                    //发起添加商品请求
                    const { data: res } = await this.$http.post('goods', form)
                    if (res.meta.status !== 201) {
                        return this.$message.error('添加商品失败')
                    }
                    this.$message.success('添加商品成功')
                    this.$router.push('/goods')
                })
            }
        },//方法最外层


        //计算属性
        computed: {
            //获取当前商品分类的三级id
            cateId() {
                //判断是否为第三级分类
                if (this.addForm.goods_cat.length === 3) {
                    return this.addForm.goods_cat[2]
                }
                return null
            }
        }
    }
</script>
<style scoped>
    .el-checkbox {
        margin: 0 5px 0 0 !important;
    }

    .imgs {
        width: 100%;
    }

    .btnAdd {
        margin-top: 15px;
    }
</style>